A Comparative Study on Primary Bearing Rating Life of a 5-MW Two-Blade Wind Turbine System Based on Two Different Control Domains

Autor:	Bonyong Koo, Dae-Yi Jung
Rok vydání:	2019
Předmět:	Control and Optimization Computer science Energy Engineering and Power Technology lcsh:Technology Turbine Wind speed law.invention collective pitch control (CPC) individual pitch control (IPC) Pitch control law wind turbine system Aerodynamic load Electrical and Electronic Engineering Engineering (miscellaneous) individual pitch control (IPC) Bearing (mechanical) Wind power lcsh:T bearing rating life Renewable Energy Sustainability and the Environment business.industry Work (physics) collective pitch control (CPC) Structural engineering Aerodynamics business Energy (miscellaneous)
Zdroj:	Energies Volume 12 Issue 13 Energies, Vol 12, Iss 13, p 2607 (2019)
ISSN:	1996-1073
DOI:	10.3390/en12132607
Popis:	Recently, the importance of individual pitch control (IPC) capability in wind turbine systems has been emphasized to achieve the desired power performance and mitigate the aerodynamic imbalance load for the mechanical integrity. Compared to collective pitch control(CPC), which assigns identical pitch angles for all employed blades, IPC is capable of generating other various sets of pitch angles to manipulate the aerodynamic load. Thus, the mechanical elements of wind turbine systems may take advantages from this variation, which allows wind turbines to have lighter designs and longer lifetimes. One of the essential mechanical components in the wind turbine is a primary bearing supporting the blades&ndash rotor&ndash shaft unit, which has not been fully investigated yet among the structural elements in the wind turbine system. In this regard, this research focuses on predicting the bearing life span of a NACA64-A17 two-blade 5-MW wind turbine system for the domains of allowable individual pitch angles by IPC. In particular, under the effect of various wind speeds, a bearing life span was determined based on the average value of load cases&mdash satisfying both appropriate power level and the allowable domain of pitch control angles, which were possibly conveyed by IPC&mdash and the result was compared with the bearing life predicted based on the domain of pitch angles, as generated by the CPC strategy. Consequently, in the ranges of high wind speeds, it was found that the average applied load to the bearing is reduced under the domain of the IPC-based pitch angle, resulting in possibly increasing the life span of the bearing. With the presented results, it is hoped that this work will provide important insights for those that majorly concern designing the primary bearing of the IPC-based wind turbine system.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4a67b879cdb0058757042d1ecc962868 https://doi.org/10.3390/en12132607 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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